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    <title>Document</title>
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      //    var b =function(){
      //         //    arguments.forEach() 没有这个方法
      //         // console.log(arguments.forEach())
      //     var a = Array.from(arguments)
      //     // console.log(a.forEach(item=>{return item}))
      //     [...]
      //    }
      //    b(1,23,3)
    //   let b = [1, 2, 3, 4, 5, 6, 7,[1,2]];
    //   let c =[...b]
    //   b[7][1]=9
      // console.log(...b);
      //    console.log({...b});
      console.log(c);
    </script>
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